Dry expansion unit



May 16, 1939. SAHA DRY EXPANSION UNIT Filed Nov. 19, 1937 3- INVENTOR. TT W B] fim ATTORNEY.

Patented May 16, 1939 UNITED -STATES PATE/:NT OFFICE V 2,158,382 DRY EXPANSION UNIT Ludwig Saba, Secane,

Pa., assignor to Saba Manufacturing Company, Inc.,

Philadelphia, Pa.

Application November 19, 1937, Serial No. 175352 4 Claims.

1 prehends a wider use thereof as it can be used V is required.

A dry expansion unit of the type with which this invention 's concerned is characterized as providing for the circulation medium in a gaseous tem of the unit. As this gaseous medium circu- (form to a spray or mist.

The invention has in view, as its foremost ob- 'ject've the provision of a dry expansion unit of the character above described which densing unit. 55 is evidenced from the uppermost point to the 'I'hus the gravity action which lowermost point in certain parts of the system is rendered effective and enhanced by the actio of the compressor.

More in detail this invention has in view the provsion of a. dry expansion unit of the character above described which is characterized as inmainunobstructed. 4

The system above described presents a. further advantage of elimnating the need for a reirigerart,

It is nctable that after the refrigerant has reachedthe lowest point of the system, and is in a partially expanded state, its return is upwardly through the central panel, and serves to draw additional heat from the interior of the cabinet to further expand the gas. It may be that during the travel of the refrigerating medium to its lowest point there will be some idle but on the drawing upwardly through the central panel this idle refrigerant is expanded and returned to the compressor in a gaseous state.

This arrangement of returning the refrigerant through the central partof the cabinet is also important as it prevents the accumulation of the outside of the return line, which condition has a tendency to be created when there is idle refrigerant in the return line from the compressor.

The use of the system of this dry expansion unit presents the further advantage of insuring ,that the compressor will operate continuously without knocking and overloading. This is a desideratum of prime importance. Whenever liquid is present in the system there is a tendency for overloading of the compressor upon being started in operation. This is entirely eliminated by the present invention.

Various other more detailed objects and advantages of the invention will in part become apparent and in part be hereinafter stated, as the description of the invention proceeds.

The invention, therefoe comprises a dry expansion unit of the character above described which is characterized by including a pair of spaced plates each carrying a system of conduits which are connected at the top by a manifold and at the bottom by a manifold. Both the inanifolds, as well as the condu'ts on the plates, are arranged to provide a gradual decline from the uppermost -point of the system, which is at the central part of the manifold, to the lowerr'nost part whichvis at the middle of the bottom manifold. From this lowermost point a series of conduits are carried by a central panel that is disposed between the spaced plates, and extends upward y in a gradual incline to the outlet which extends to the compressor. Particular features of the invention reside in the plate construction of the unit 'which defines the supporting structure for the various conduits. p

For a full and more complete Understanding of the invention reference may be had to the following description and accompanying drawing, wherein Figure 1 is a perspective View of a dry expansion unit made in accordance with the precepts of this invention,

Figure 2 is a view in end elevation of the unit shown in Figure l, and

Figure 3 is a perspective View of the various conduits making up the system. Inthisview the plate structure has. been eliminated to more clearly bring out the arrangement of the conduits.

At this point it is well to note that the various conduits making up the units may be plemental corrugate'd plates, or any other construction which defines the desired conduits.

Reerring now to the drawing. wherein like reference characters denote corresponding parts, a dry expansion unit such as contemplated by this invention is shown in Figure 1 as comprising a central panel referred to in its entirety by the !5 that corresponds defined either by tubes, com- 2,15s,ss2

reference character C, and two side plates which are reerred to generally as S and S. The side plate S is deflned by a sheet of metal designated n iormed with an upper fiange ll. The upper part of the plate Il! is formed with a recess |2 for a purpose to be hereinafter described.

Preferably integrally connected to the plate IO at the bottom thereof is a' bottom plate member 13 that is intended to lie against the bottom of a' refrigerating cabinet with which the unit is to be used, and this bottom plate !3 has integrally connected therewith a central e wall !4 making up one side of the central panel C.. The end edges of the plates o and N are connected by end walls designated 9.

The side plate. S is defined by a plate member to the plate member HI and which is formed at its upper edge with the flange I6. The top portion of the plate |5 is ormed with a recess I1 that corresponds to the recess I2, and for a purpose which 'll .be hereinafter pointed out.

A bottom plate member !8 is integrally connected at one side to the bottom edge of the plate !5, and at its other side is integrally connected with a side wall |`9 that forms a part of the central panel C. The end edges of the plates !5 and IS are connected by end walls 8.

The upper edge of the side wall IQ is formed with a top wall 26 that terminates in a depending fiange 2l that overhangs the upper edge of the wall l4. The "upper portions of the walls Il and IS, as well as the flange 2l, are formed with a recess 22 for a. purpose to be hereinafter described.

At this point it is well to note that the plate structure above described may be maintained assembled by* suitable fastening elements (not shown) that are associated with the walls Il and s of the centraLpanel C. However, when the unit has been removed from the int'erior of the cabinet these fastening elements may be loosened so that the central panel C may be readily dissembled and access had to the tubular system contained therewithin.

A tubular member 23 is intended to be connected with the compressor of a conventional refrigerating system, and conveys a refrigerating medium in the liquid state to. an expansion valve represented at 24. From the expansion valve the refrigrating medium is intended to be introduced into the tubular system carried by the side plates S S and central panel C in a gaseous state. At this point it is well to note that any suitable refrigerating medium may' be employed,

such as sulphur dioxide.

where it passes through the recess l 'l, and this piece of tubing is continued to define a plurality of bends referred to as 28, which are carried on side plate 15. These bends 28 of the tubing may be anchored to the plate l5 in any preferred manner, such as by being soldered thereto.

Similarly a piece of tubing 29 extends from the T coupling 26 'outwardly on a slight decline to the side plate' S on the other side, where it passes through the recess I2 and is continued as a pluraiity-of bends referred to as 30. and which bends T coupling 26 out-` are anchored to the side plate u in any preferred manner, as by soldering.

The bends 28 of the plate are continued to the bottom of`the plate !5, where'the tube ex-.

tension 3l passes on the underside of the bottom 'plate |8 to a second T coupling member 32, and

nect the lower-most of the bends 30 with the T coupling 32. It is notable that the extensions 3! and 33 are inclined downwardly to the T couand 29 outwardly to the bends 28 and 30 and side respectively.

The refrigerating medium then passes-downwardly, under gravity action, through these bends 28 and 30 to the extensions 3| and 33 where refrigeratingmedium.

Moreover, with* the tubing arranged in the system illustrated in the drawing and described passed downwardly through the side plates S and S and returned upwardly through the central panel C.

The particular relationship of the side plates 3 practice within the purview 'of the appended claims.

I claim:

1. A dry expan'sion unit of the character described .comprising a pair of conduit systems spaced apart, said systems being connected at the top by a manifold and at the bottom, by a manifold, an inlet for a refrigerating medium connected to the central part of said top manifold,

and an outlet for the refrigerating medium connected to the central part of the bottom manifold, there being a gradual incline from the cen-' tral part of the top manifold through the manifolds and systems of conduits to the c'entral part of the bottom manifold 2. A dry expansion unit of the character described comprsing a central panel defined by a pair of side walls, a pair of side plates disposed on either side of the central panel and consist- ,ing of platemembers that are integrally connected with the side walls tubing arranged in bends of the central panel, and anchored to the and tubing anchored panel for connectng the same to a refrigerating system.

tubes on the side plates. e

4. A dry expansion unit of the character'described comprising a pair of cooling chambers arranged in spaced side by side relationship and defined by metallic plate structures, each chamber including inner and outer side walls, a conduit system on the outer side wall of each chamber, and a conduit system interposed between the inner side walls ofthe chambers, a manifold connected to each of the conduit systems on the outer side walls at the top, connections at the bottom between each or the conduit systems on the outer side walls and the conduit system between the inner side walls, an outlet at the upper end of the conduit system between the Inner side walls. and an inlet connected to said manifold.

- LUDWIG SARA. 

